title: Sequestration of metals through association with pyrite in subtidal sediments of the Nanpaishui Estuary on the Western Bank of the Bohai Sea, China.
abstract: Measurements were made of the degree of trace metal pyritization (DTMP) and ancillary characteristics of four undisturbed sediment cores collected from the subtidal zone of the Nanpaishui Estuary on the Western Bank of the Bohai Sea, a seriously polluted inland sea in northeastern China. The remarkably low concentrations of organic carbon (<0.72%) in these sediments likely constrained sulfate reduction rates, and the low concentrations of acid volatile sulfide (AVS) (<12.5 μmol g(-1)) limited the sequestration of metals through association with pyrite. The most consistent cause of inter-station differences and depth variations in the degree of pyritization was differences in pyrite metal concentrations rather than reactive metal concentrations. Reactive metal concentrations were in several cases negatively correlated with pore water concentrations, consistent with a dissolution/precipitation mechanism. The relationship between pore water metal concentrations and DTMPs was evidenced by a qualitative similarity of the inter-station variability of these same parameters.
authors.affiliation: Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, P.O. Box 266071, Qingdao, PR China. siyuanye@hotmail.com
authors.forename: Siyuan
authors.initials: S
authors.lastname: Ye
authors.forename: Edward A
authors.initials: EA
authors.lastname: Laws
authors.forename: Shaojun
authors.initials: S
authors.lastname: Zhong
authors.forename: Xigui
authors.initials: X
authors.lastname: Ding
authors.forename: Shouji
authors.initials: S
authors.lastname: Pang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D012623:Seawater / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D019216:Metals, Heavy; D013440:Sulfides; D014874:Water Pollutants, Chemical; C011342:pyrite; D007501:Iron